Amplify Gravity

This spell intensifies gravity in a 50-foot-radius area within range. Inside the area, damage from falling is quadrupled (2d6 per 5 feet fallen) and maximum damage from falling is 40d6. Any creature on the ground in the area when the spell is cast must make a successful Strength saving throw or be knocked prone; the same applies to a creature that enters the area or ends its turn in the area. A prone creature in the area must make a successful Strength saving throw to stand up. A creature on the ground in the area moves at half speed and has disadvantage on Dexterity checks and ranged attack rolls.